Drill and underreamer.



'PATE- NTED NOV. l, 1.904.

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IINTTen STATes Patented November 1, 1904.

PATENT `Ormea.,

EDWARD MGORAY AND FRANK A. WISER, OF LOS ANGELES, CALIFORNIA.

DRILL AND UNDERREANIER.

SPECIFICATION forming part of Letters Patent No. 773,962, dated` November 1, 1904.

u y Application led May 3l, 1904. Serial No. 210,391. No mcdely To all whmn t may concern:

drill that will hold to center or alinement with the casing.

A further object of the invention is to pro- Vide the drill part with means whereby it will tend to hold the underreaming-bit out to its work.

The invention comprises a drill with an underreaming-bit in proximity to its drill part and with the drill-point formed to act by its impingement on the material at the bottom of the hole to hold the underreaniing-bit over against its work and keep the tool as a whole in alinement with the easing in opposition to the side thrust of the underreaining-bit.

The accompanying drawings illustrate the invention.

Figure l is a side elevation of the drill and I `underreamer with part of its Vlength broken away. Fig. 2 is an inverted plan. Fig. 3 is an edge View looking toward the right in Fig. '1. Fig. 4 is an edge View on the opposite side to Fig. 3, the drill being broken or sectioned on the line a? a?, Fig. l.

l represents a drill-body provided with the usual attachment-shank or screw means 2. and at its lower end with the drill-bit 3 and with the underrearning-bit 4, the latter located in proximity to but somewhat above the drillbit. The drill-body is desirably flattened-- that is, it is` wider in one direction than in the other. The cutting edge 5 of the drill-bit extends in the direction of the greater dimension or width of the bit and is located substantially in line with the central or working axis of the drill proper, said axis (indicated at :r fr) being central with respect to the drillshank. The upper end 6 of the drill-body is concentric with this axis; but the main body of the tool from the'upper end down is fiattened, as stated, and extends outwardly to one side of this axis more than to the other side, the outward extension (indicated at 7) being formed at its lower end with the underreaming-bit 4.

At one end of the cutting edge 5 the drillbody has a beveled or inclined portion 8 extending downwardly and inwardly, and at the other end of the cutting edge, below the underreamer-bit, the drill has a iiat edge or face 9. The cutting edge 5 is desir-ably formed as a chisel-edge extending in the plane of. the width of the bit, and the underreamer-bit 4 extends transversely to this plane, with -its bottom face l0 rounded or formed as a segment ot' a cylinder. The underreamer edge projects laterally beyond body of the tool. Incline-8 may also be formed as a chisel-edge.

On each side or face the drill-body l is formed with achannel or groove 11 to enable the escape or passageot'gthe drilled material.

The tool is used as follows: The drill-body, including the lateral extension 7, is of such width that it can be slipped down within the tubular casing. In passing through the casing the body as a whole will be concentric therewith, but the working axis and bit will be a little to one side of the center of the casing; but when the drill-bit passes beyond the casing and reaches the end of the hole it will be centered thereby, the incline 8 bringing it to center by engagement in the end of the hole, and by this action thel underreainer-lnt 4 will be caused to project beneath the bottom of the casing. On reciprocating the drill vertically in the usual manner and partially turning the saine from time to time or at each stroke the hole will be deepened in alineinent with the axis of the casing and will be sinnlitaneously enlarged to enable the casing to be lowered. At each downward stroke the ineline 8 will Jforce or hold the drill-bit over to drive or keep the underreainer-bit against the side of the hole.

The construction of the bit may be variously modified without departing from our invention.

What we claim is--- 1. In a drill and underreainer, a drill-body having a drill-bit at its end in alinement with the working axis of the drill, an umlerreainer- IOO bit at one side oi said axis, and anincline at the other side of said axis to hold the underrearner to its work.

2. ln adrill and underreamer, a drill-body having a drill-bit at its end in alinement with the working axis of the drill` an underreainerbit at one side of said axis, and an incline at the other side of said axis to hold the underreainer to its work, said incline being adjacent to the drill-bit and said underreainer being in proximity to but above the drill-bit.

3. lln a drill and underreamer, a drill-body having a drill-bit at its end in alinenient with the working axis oi" the drill, an underrearnerbody having an incline on the end of the drill bit opposite the underreainer.

5. A liattened drill-body having a drill-bit at its end in line with its working axis., an extension along one side oi' said body provided at its lower end with an underrearnerbit, above but in proximity to the drill-bit, said ieamerbitlabove but in proximity to the drill-bit7 said drill-bit having its edge in the direction of the width of the drill-body,

and the drill-body having an incline on the end ot' the drill-bit opposite the underreamer, and said drillb0dy being channeled on each side.

6. A `liattened drill-body having a drill-bit at its end in line with its working axis, an extension along one side of said body provided at its lower end with an nnderreainerbit, above and in proximity to the drill-bit7 said drill having its ,edge in the direction oi' the width oi' the drillbody, said underrearnerbit extending transversely to the drill-bit, and thedrilbbody having an incline on the end ot' the drill-bit opposite to the underreainer.

Y. A dattened drill-body having a drill-bit at its end in line with its wor-king axis, an extension along one side of said body provided at its lower end with an underrealner-bit., above and in proximity tothe drill-bit7 said drill-bit having its edge in the direction of the width of the drill-body, said underrearnerbit extending transverse to the underreanieiI- bit and projecting laterally troni the drillbody and having a rounded lower face and the drill-body having an-'incline on the end of the drill-bit opposite to the underrearner.

ln testimony whereoi` we have signed our names to this speeificatiom in the presence ot two subscribing witnesses, at Los Angeles, county oi' Los Angeles, and State oi' Calitornia, this 214th day of May5-l904.

EDWARD MCCRAY. FRANK A., lWllSER.A Witnesses:

ARTHUR l. KNIGHT, FREDERICK S. LYON. 

